伪元素-空心倒三角

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于 2017-08-31 19:07:05 发布

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分类专栏： CSS

本文链接：https://blog.youkuaiyun.com/Sodaliy/article/details/77751459

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>小三角</title>
    <style>
        .z_r:before{
            content: '';
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-bottom: 10px solid red;
            position: absolute;
            top: -10px;
            left: 20px;
        }
        .z_r:after{
            content: '';
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-bottom: 10px solid white;
            position: absolute;
            top: -8px;
            left: 20px;
        }

         .z_r {
            position: absolute;
            width: 100px;
            margin: 100px auto;
            background-color: white;
            border: 1px solid red;
            text-align: center;
         }
         body {
            background-color: black
         }
    </style>
</head>
<body>
    <div class="z_r">伪元素箭头</div>
</body>
</html>